Which one of the following statements is correct?

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Q: 64 (NDA-II/2015)

Which one of the following statements is correct?
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question_subject: 

Science

question_exam: 

NDA-II

stats: 

0,17,6,17,0,2,4

keywords: 

{'concave mirror': [0, 0, 2, 6], 'spherical mirror': [0, 0, 0, 1], 'focal length': [1, 0, 5, 7], 'curvature': [0, 0, 1, 0], 'reflection': [1, 1, 2, 19], 'mirror': [0, 0, 0, 1], 'principal focus': [0, 0, 1, 2], 'denser medium bends': [0, 0, 0, 1], 'infinity': [0, 0, 1, 7], 'principal axis': [0, 0, 1, 1], 'radius': [0, 0, 2, 2], 'ray': [2, 0, 5, 15], 'light': [16, 4, 34, 62]}